Strange behaviour of my Inspiration

Humuhumu · 14th July 2008, 17:28

Hi,

last Saturday I was underwater with my YBOD. First dive was with a level 2 CMAS Student and we have made some exercises (signs and reactions on signs, nothing special) in a depth of maximum 25M and a dive time of 40 minutes. Second dive, immediately after my student was out of the water we decided to make a second dive. I was with another diver (Megalodon). We went down to 20/23M and suddenly I got a cell alarm: all 3 cells on both computers... This happened as the PpO2 went high (I have it on automatic at 20M). The alarm disappeared immediately and I flushed the machine with AIR and noticed that all 3 cells were reacting similarly so I decided to continue my dive. We were down to 34 M and go for another 30 minutes without any problems.

My Inspiration Vision is brand new so new solenoid, new cells, etc

Any ideas of what happened ?

Cheers

Humuhumu

**PhilSiswick** · 14th July 2008, 17:37

Quote: (Originally Posted by Humuhumu)

Hi,

last Saturday I was underwater with my YBOD. First dive was with a level 2 CMAS Student and we have made some exercises (signs and reactions on signs, nothing special) in a depth of maximum 25M and a dive time of 40 minutes. Second dive, immediately after my student was out of the water we decided to make a second dive. I was with another diver (Megalodon). We went down to 20/23M and suddenly I got a cell alarm: all 3 cells on both computers... This happened as the PpO2 went high (I have it on automatic at 20M). The alarm disappeared immediately and I flushed the machine with AIR and noticed that all 3 cells were reacting similarly so I decided to continue my dive. We were down to 34 M and go for another 30 minutes without any problems.

My Inspiration Vision is brand new so new solenoid, new cells, etc

Any ideas of what happened ?

Cheers

Humuhumu

Yes, I've had this, though usually only on one cell. One of my buddies had problems with this as well, on a brand new head. He sent it back to AP, who told him that he wasn't breathing enough :-)

Essentially, I think it comes from the rapid spike you get when you switch up the setpoint. I've found that it is more likely to happen with new cells, maybe because they are more sensitive. With a little time, they settle down.

As it's annoying (and worrying), I try to let my PO2 creep up towards my target setpoint as I reach the bottom. That way, there's no big swing in PO2meaning less bouyancy change, fewer alarms and less load on the battery.

HTH,

KevDD · 14th July 2008, 18:14

It seems to be a feature of the visions

Tino de Rijk · 14th July 2008, 22:18

Quote: (Originally Posted by KevDD)

It seems to be a feature of the visions

No it is not.
Contact the factory. It has to do with the outlet (nozzle) of the new solenoid. It typically appears when switching from low to high setpoint. The nozzle of the new solenoid then causes a small "whirlwind" which causes a small "bubble" of O2 to temporarily stick with the cells.
APD has developed a better nozzle that causes a better mix in the scruber head, supposedly getting rid of this nuisance.
MartinP from APD wrote about this on the Inspo mailing list a week ago or so.
contact the factory to see if this is your problem. If so, it's easily fixed.
Untill that time, it is not a worrying feature: it only occurs when the solenoid opens a long time (as in switching from low to high setpoint), and it is just a bubble of O2 sitting at the cells temporarily (as in: a few seconds).
It doesn't mean you actually breath that high PO2, as the bubble gets diluted in C/L and hose before it reaches the mouthpiece. Even if you were to breath it, that would only be for a few seconds.
So nuisance, not danger.
But check with APD to be sure: my info is based on hear-say, albeit well informed hear-say... :-)

Ciao,

Tino.

Humuhumu · 15th July 2008, 11:53

Thank you guys it's good to hear that you have experienced the same. In fact I was not anxious as I get control of the situation quickly. I will mail to APD to fix the problem.

Cheers

Humuhumu

intouch1 · 18th July 2008, 19:36

its' just annoying I guess as these alarms do grab your focus and attention.
mine on a brand new Evo with less than 15 hours dive time is giving me cell warnings on a single cell as well. i also usually have a cell that is a bit behind the other two.....

Humuhumu · 19th July 2008, 14:46

Hi,

had the same problem this morning. It happens always when you go on the high set point. I had a very short cell alarm, just on the vision, no buzzer, so very very fast. My PpO2 climbed to 1,45 and so it's not a problem (I can do with 2 for a moment, I had to in the past with my special Dolphin :-). After a second it was back down to 1,2, that's a prove that it's a problem in relation with the new solenoid. APD have offered me to analyze the logs to see how they can fix this, but I'm confident, the problem is well know, their service is excellent, so this should all be fixed shortly.

Cheers

Humuhumu

aborigene · 28th July 2008, 20:59

Hi,
Tino , what do you mean by "APD has developed a better nozzle" ? Do you mean that a spare exists ?
thank you

gallathan · 29th July 2008, 13:17

I emailed Nicky @ AP, and they sent me a new / replacement nozzle for the new solenoid, free of charge. Looks different / sounds different / easy to fit. Definitely improved the issue, so problem with 20+ dives on it so far...

Humuhumu · 14th August 2008, 20:45

Hi,

I have sent my new logs (6) to Zoe. I still have the same problems. I have made a dive on the "TOGO" (a wreck near Cavalaire 50 to 55 and more) and had also a problem while ascending. In fact I had to assist the diver who was with me and lost 0,6M, that produced a "high oxygen" alarm (setpoint 1,4 --> over 1,6) ! I'm waiting for some inputs from APD.

As I have made some dives with other YBOD users (classics) I can say, they didn't have the same problems.

Anyway great unit, I'm very happy to have made this choice, after 2 years with my Dolphin !

Cheers

Humuhumu

14th July 2008, 17:28	#1 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Strange behaviour of my Inspiration Hi, last Saturday I was underwater with my YBOD. First dive was with a level 2 CMAS Student and we have made some exercises (signs and reactions on signs, nothing special) in a depth of maximum 25M and a dive time of 40 minutes. Second dive, immediately after my student was out of the water we decided to make a second dive. I was with another diver (Megalodon). We went down to 20/23M and suddenly I got a cell alarm: all 3 cells on both computers... This happened as the PpO2 went high (I have it on automatic at 20M). The alarm disappeared immediately and I flushed the machine with AIR and noticed that all 3 cells were reacting similarly so I decided to continue my dive. We were down to 34 M and go for another 30 minutes without any problems. My Inspiration Vision is brand new so new solenoid, new cells, etc Any ideas of what happened ? Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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14th July 2008, 17:37	#2 (permalink)
PhilSiswick Phil Siswick, Tango Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Vision Join Date: Apr 2006 Location: Oxford, UK Posts: 1,099	Re: Strange behaviour of my Inspiration Quote: (Originally Posted by Humuhumu) Hi, last Saturday I was underwater with my YBOD. First dive was with a level 2 CMAS Student and we have made some exercises (signs and reactions on signs, nothing special) in a depth of maximum 25M and a dive time of 40 minutes. Second dive, immediately after my student was out of the water we decided to make a second dive. I was with another diver (Megalodon). We went down to 20/23M and suddenly I got a cell alarm: all 3 cells on both computers... This happened as the PpO2 went high (I have it on automatic at 20M). The alarm disappeared immediately and I flushed the machine with AIR and noticed that all 3 cells were reacting similarly so I decided to continue my dive. We were down to 34 M and go for another 30 minutes without any problems. My Inspiration Vision is brand new so new solenoid, new cells, etc Any ideas of what happened ? Cheers Humuhumu Yes, I've had this, though usually only on one cell. One of my buddies had problems with this as well, on a brand new head. He sent it back to AP, who told him that he wasn't breathing enough :-) Essentially, I think it comes from the rapid spike you get when you switch up the setpoint. I've found that it is more likely to happen with new cells, maybe because they are more sensitive. With a little time, they settle down. As it's annoying (and worrying), I try to let my PO2 creep up towards my target setpoint as I reach the bottom. That way, there's no big swing in PO2meaning less bouyancy change, fewer alarms and less load on the battery. HTH, __________________ Phil (WSKD 0001) I have always felt that the dive I am on is not nearly important as the dives I plan to be on the rest of my life. Tom Rose, 2007 The person who gets the farthest is generally the one who is willing to do and dare. The sure thing boat never gets far from shore. Charles A. Lindbergh www.hugsac.org.uk Last edited by PhilSiswick : 14th July 2008 at 20:58.
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14th July 2008, 18:14	#3 (permalink)
KevDD Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Oct 2005 Location: Dublin, Ireland Posts: 99	Re: Strange behaviour of my Inspiration It seems to be a feature of the visions
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14th July 2008, 22:18	#4 (permalink)
Tino de Rijk Old, maybe one day wise Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Evolution Join Date: Mar 2006 Location: Amsterdam Posts: 375	Re: Strange behaviour of my Inspiration Quote: (Originally Posted by KevDD) It seems to be a feature of the visions No it is not. Contact the factory. It has to do with the outlet (nozzle) of the new solenoid. It typically appears when switching from low to high setpoint. The nozzle of the new solenoid then causes a small "whirlwind" which causes a small "bubble" of O2 to temporarily stick with the cells. APD has developed a better nozzle that causes a better mix in the scruber head, supposedly getting rid of this nuisance. MartinP from APD wrote about this on the Inspo mailing list a week ago or so. contact the factory to see if this is your problem. If so, it's easily fixed. Untill that time, it is not a worrying feature: it only occurs when the solenoid opens a long time (as in switching from low to high setpoint), and it is just a bubble of O2 sitting at the cells temporarily (as in: a few seconds). It doesn't mean you actually breath that high PO2, as the bubble gets diluted in C/L and hose before it reaches the mouthpiece. Even if you were to breath it, that would only be for a few seconds. So nuisance, not danger. But check with APD to be sure: my info is based on hear-say, albeit well informed hear-say... :-) Ciao, Tino.
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15th July 2008, 11:53	#5 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Strange behaviour of my Inspiration Thank you guys it's good to hear that you have experienced the same. In fact I was not anxious as I get control of the situation quickly. I will mail to APD to fix the problem. Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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18th July 2008, 19:36	#6 (permalink)
intouch1 New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Sep 2007 Location: Red Sea Posts: 13	Re: Strange behaviour of my Inspiration its' just annoying I guess as these alarms do grab your focus and attention. mine on a brand new Evo with less than 15 hours dive time is giving me cell warnings on a single cell as well. i also usually have a cell that is a bit behind the other two.....
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19th July 2008, 14:46	#7 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Strange behaviour of my Inspiration Hi, had the same problem this morning. It happens always when you go on the high set point. I had a very short cell alarm, just on the vision, no buzzer, so very very fast. My PpO2 climbed to 1,45 and so it's not a problem (I can do with 2 for a moment, I had to in the past with my special Dolphin :-). After a second it was back down to 1,2, that's a prove that it's a problem in relation with the new solenoid. APD have offered me to analyze the logs to see how they can fix this, but I'm confident, the problem is well know, their service is excellent, so this should all be fixed shortly. Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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28th July 2008, 20:59	#8 (permalink)
aborigene New Member Current Rebreather/s: Inspiration Classic Inspiration Vision Other Rebreather/s: Join Date: Jan 2008 Location: Bandol (south of France) Posts: 8	Re: Strange behaviour of my Inspiration Hi, Tino , what do you mean by "APD has developed a better nozzle" ? Do you mean that a spare exists ? thank you
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29th July 2008, 13:17	#9 (permalink)
gallathan still learning... Current Rebreather/s: Inspiration Classic Inspiration Vision Other Rebreather/s: Join Date: Mar 2006 Location: Laleham, Middlesex, England, UK Posts: 68	Re: Strange behaviour of my Inspiration I emailed Nicky @ AP, and they sent me a new / replacement nozzle for the new solenoid, free of charge. Looks different / sounds different / easy to fit. Definitely improved the issue, so problem with 20+ dives on it so far...
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14th August 2008, 20:45	#10 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: Strange behaviour of my Inspiration Hi, I have sent my new logs (6) to Zoe. I still have the same problems. I have made a dive on the "TOGO" (a wreck near Cavalaire 50 to 55 and more) and had also a problem while ascending. In fact I had to assist the diver who was with me and lost 0,6M, that produced a "high oxygen" alarm (setpoint 1,4 --> over 1,6) ! I'm waiting for some inputs from APD. As I have made some dives with other YBOD users (classics) I can say, they didn't have the same problems. Anyway great unit, I'm very happy to have made this choice, after 2 years with my Dolphin ! Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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